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Share-based payments - Movements in the weighted average exercise price of share options (Details) - EMI share option scheme - £ / shares | 6 Months Ended | 12 Months Ended
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Jun. 30, 2022 | Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average exercise price, options outstanding, start of period | £ 308.06 | £ 143.28
Weighted average exercise price, options granted during the period |  | 1,178.94
Weighted average exercise price, options grant arising due to scheme modification | 0.23 |
Weighted average exercise price, options forfeited during the period | 0.83 | 204.00
Weighted average exercise price, options outstanding, end of period | £ 0.19 | £ 308.06

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- Definition The weighted average exercise price of share options forfeited in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2021-03-24 + Details
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